Add more comprehensive tests for slotchange events

third_party/WebKit/Source/core/html/HTMLSlotElement.cpp

 /*
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 297 matching lines @@
             next->enqueueSlotChangeEvent();
     }
 }
 
 bool HTMLSlotElement::hasAssignedNodesSlow() const
 {
     ShadowRoot* root = containingShadowRoot();
     DCHECK(root);
     DCHECK(root->isV1());
     SlotAssignment& assignment = root->ensureSlotAssignment();
-    if (assignment.findSlot(*this) != this)
+    if (assignment.findSlotByName(name()) != this)
         return false;
     return assignment.findHostChildBySlotName(name());
 }
 
 bool HTMLSlotElement::findHostChildWithSameSlotName() const
 {
     ShadowRoot* root = containingShadowRoot();
     DCHECK(root);
     DCHECK(root->isV1());
     SlotAssignment& assignment = root->ensureSlotAssignment();
     return assignment.findHostChildBySlotName(name());
 }
 
 short HTMLSlotElement::tabIndex() const
 {
     return Element::tabIndex();
 }
 
 DEFINE_TRACE(HTMLSlotElement)
 {
     visitor->trace(m_assignedNodes);
     visitor->trace(m_distributedNodes);
     visitor->trace(m_distributedIndices);
     HTMLElement::trace(visitor);
 }
 
 } // namespace blink